The food enters  the buccal cavity and the food is chewed, grinded with the help of the 4 types of  teeth. Then it enters the pharynx and reaches the oesophagus
and it moves with a movement known as the peristaltic movement and the food reaches the stomach. A powerful acid known as the hcl is released in the         stomach. The food is turned into bolus in the mouth and turned into chyme in the stomach. The food reaches the duodenum, intestine and the fats are digested in the intestine. The food is totally digested in the intestine and reaches the anus. The food is sent out of the body through the anus.
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The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). In this system, the process of digestion has many stages, the first of which starts in the mouth (oral cavity). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The secretion of saliva helps to produce a bolus which can be swallowed to pass down the oesophagus and into thestomach.

Saliva also contains a catalytic enzyme called amylase which starts to act on food in the mouth. Another digestive enzyme called lingual lipase is secreted by some of the lingual papillae on the tongue and also from serous glands in the main salivary glands. Digestion is helped by the mastication of food by the teeth and also by the muscular actions ofperistalsis and segmentation contractions. Gastric juice in the stomach is essential for the continuation of digestion as is the production of mucus in the stomach.

Peristalsis is the rhythmic contraction of muscles that begins in the oesophagus and continues along the wall of the stomach and the rest of the gastrointestinal tract. This initially results in the production of chyme which when fully broken down in the small intestine is absorbed as chyle into the lymphatic system. Most of the digestion of food takes place in the small intestine. Water and some minerals are reabsorbed back into the blood in the colon of the large intestine. The waste products of digestion are defecated from the anus via therectum.

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